src/modules/m_httpd.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "httpd.h"
  16
  17 /* $ModDesc: Provides HTTP serving facilities to modules */
  18 /* $ModDep: httpd.h */
  19
  20 class ModuleHttpServer;
  21
  22 static ModuleHttpServer* HttpModule;
  23 static bool claimed;
  24
  25 /** HTTP socket states
  26  */
  27 enum HttpState
  28 {
  29         HTTP_SERVE_WAIT_REQUEST = 0, /* Waiting for a full request */
  30         HTTP_SERVE_RECV_POSTDATA = 1, /* Waiting to finish recieving POST data */
  31         HTTP_SERVE_SEND_DATA = 2 /* Sending response */
  32 };
  33
  34 /** A socket used for HTTP transport
  35  */
  36 class HttpServerSocket : public BufferedSocket
  37 {
  38         FileReader* index;
  39         HttpState InternalState;
  40
  41         HTTPHeaders headers;
  42         std::string reqbuffer;
  43         std::string postdata;
  44         unsigned int postsize;
  45         std::string request_type;
  46         std::string uri;
  47         std::string http_version;
  48
  49  public:
  50
  51         HttpServerSocket(InspIRCd* SI, int newfd, char* ip, FileReader* ind) : BufferedSocket(SI, newfd, ip), index(ind), postsize(0)
  52         {
  53                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  54         }
  55
  56         FileReader* GetIndex()
  57         {
  58                 return index;
  59         }
  60
  61         ~HttpServerSocket()
  62         {
  63         }
  64
  65         virtual void OnClose()
  66         {
  67         }
  68
  69         std::string Response(int response)
  70         {
  71                 switch (response)
  72                 {
  73                         case 100:
  74                                 return "CONTINUE";
  75                         case 101:
  76                                 return "SWITCHING PROTOCOLS";
  77                         case 200:
  78                                 return "OK";
  79                         case 201:
  80                                 return "CREATED";
  81                         case 202:
  82                                 return "ACCEPTED";
  83                         case 203:
  84                                 return "NON-AUTHORITATIVE INFORMATION";
  85                         case 204:
  86                                 return "NO CONTENT";
  87                         case 205:
  88                                 return "RESET CONTENT";
  89                         case 206:
  90                                 return "PARTIAL CONTENT";
  91                         case 300:
  92                                 return "MULTIPLE CHOICES";
  93                         case 301:
  94                                 return "MOVED PERMENANTLY";
  95                         case 302:
  96                                 return "FOUND";
  97                         case 303:
  98                                 return "SEE OTHER";
  99                         case 304:
 100                                 return "NOT MODIFIED";
 101                         case 305:
 102                                 return "USE PROXY";
 103                         case 307:
 104                                 return "TEMPORARY REDIRECT";
 105                         case 400:
 106                                 return "BAD REQUEST";
 107                         case 401:
 108                                 return "UNAUTHORIZED";
 109                         case 402:
 110                                 return "PAYMENT REQUIRED";
 111                         case 403:
 112                                 return "FORBIDDEN";
 113                         case 404:
 114                                 return "NOT FOUND";
 115                         case 405:
 116                                 return "METHOD NOT ALLOWED";
 117                         case 406:
 118                                 return "NOT ACCEPTABLE";
 119                         case 407:
 120                                 return "PROXY AUTHENTICATION REQUIRED";
 121                         case 408:
 122                                 return "REQUEST TIMEOUT";
 123                         case 409:
 124                                 return "CONFLICT";
 125                         case 410:
 126                                 return "GONE";
 127                         case 411:
 128                                 return "LENGTH REQUIRED";
 129                         case 412:
 130                                 return "PRECONDITION FAILED";
 131                         case 413:
 132                                 return "REQUEST ENTITY TOO LARGE";
 133                         case 414:
 134                                 return "REQUEST-URI TOO LONG";
 135                         case 415:
 136                                 return "UNSUPPORTED MEDIA TYPE";
 137                         case 416:
 138                                 return "REQUESTED RANGE NOT SATISFIABLE";
 139                         case 417:
 140                                 return "EXPECTATION FAILED";
 141                         case 500:
 142                                 return "INTERNAL SERVER ERROR";
 143                         case 501:
 144                                 return "NOT IMPLEMENTED";
 145                         case 502:
 146                                 return "BAD GATEWAY";
 147                         case 503:
 148                                 return "SERVICE UNAVAILABLE";
 149                         case 504:
 150                                 return "GATEWAY TIMEOUT";
 151                         case 505:
 152                                 return "HTTP VERSION NOT SUPPORTED";
 153                         default:
 154                                 return "WTF";
 155                         break;
 156
 157                 }
 158         }
 159
 160         void SendHTTPError(int response)
 161         {
 162                 HTTPHeaders empty;
 163                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 164                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 165
 166                 SendHeaders(data.length(), response, empty);
 167                 this->Write(data);
 168         }
 169
 170         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 171         {
 172
 173                 this->Write(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 174
 175                 time_t local = this->ServerInstance->Time();
 176                 struct tm *timeinfo = gmtime(&local);
 177                 char *date = asctime(timeinfo);
 178                 date[strlen(date) - 1] = '\0';
 179                 rheaders.CreateHeader("Date", date);
 180
 181                 rheaders.CreateHeader("Server", "InspIRCd/m_httpd.so/1.2");
 182                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 183
 184                 if (size)
 185                         rheaders.CreateHeader("Content-Type", "text/html");
 186                 else
 187                         rheaders.RemoveHeader("Content-Type");
 188
 189                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 190                  * so remove it, its not essential for what we need.
 191                  */
 192                 rheaders.SetHeader("Connection", "Close");
 193
 194                 this->Write(rheaders.GetFormattedHeaders());
 195                 this->Write("\r\n");
 196         }
 197
 198         virtual bool OnDataReady()
 199         {
 200                 const char* data = this->Read();
 201
 202                 /* Check that the data read is a valid pointer and it has some content */
 203                 if (!data || !*data)
 204                         return false;
 205
 206                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 207                 {
 208                         postdata.append(data);
 209                         if (postdata.length() >= postsize)
 210                                 ServeData();
 211                 }
 212                 else
 213                 {
 214                         reqbuffer.append(data);
 215
 216                         if (reqbuffer.length() >= 8192)
 217                         {
 218                                 ServerInstance->Logs->Log("m_httpd",DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 219                                 reqbuffer.clear();
 220                                 return false;
 221                         }
 222
 223                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 224                                 CheckRequestBuffer();
 225                 }
 226
 227                 return true;
 228         }
 229
 230         void CheckRequestBuffer()
 231         {
 232                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 233                 if (reqend == std::string::npos)
 234                         return;
 235
 236                 // We have the headers; parse them all
 237                 std::string::size_type hbegin = 0, hend;
 238                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 239                 {
 240                         if (hbegin == hend)
 241                                 break;
 242
 243                         if (request_type.empty())
 244                         {
 245                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 246                                 cheader >> request_type;
 247                                 cheader >> uri;
 248                                 cheader >> http_version;
 249
 250                                 if (request_type.empty() || uri.empty() || http_version.empty())
 251                                 {
 252                                         SendHTTPError(400);
 253                                         return;
 254                                 }
 255
 256                                 hbegin = hend + 2;
 257                                 continue;
 258                         }
 259
 260                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 261
 262                         std::string::size_type fieldsep = cheader.find(':');
 263                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 264                         {
 265                                 SendHTTPError(400);
 266                                 return;
 267                         }
 268
 269                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 270
 271                         hbegin = hend + 2;
 272                 }
 273
 274                 reqbuffer.erase(0, reqend + 4);
 275
 276                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 277                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 278
 279                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 280                 {
 281                         SendHTTPError(505);
 282                         return;
 283                 }
 284
 285                 if (headers.IsSet("Content-Length") && (postsize = atoi(headers.GetHeader("Content-Length").c_str())) != 0)
 286                 {
 287                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 288
 289                         if (reqbuffer.length() >= postsize)
 290                         {
 291                                 postdata = reqbuffer.substr(0, postsize);
 292                                 reqbuffer.erase(0, postsize);
 293                         }
 294                         else if (!reqbuffer.empty())
 295                         {
 296                                 postdata = reqbuffer;
 297                                 reqbuffer.clear();
 298                         }
 299
 300                         if (postdata.length() >= postsize)
 301                                 ServeData();
 302
 303                         return;
 304                 }
 305
 306                 ServeData();
 307         }
 308
 309         void ServeData()
 310         {
 311                 InternalState = HTTP_SERVE_SEND_DATA;
 312
 313                 if ((request_type == "GET") && (uri == "/"))
 314                 {
 315                         HTTPHeaders empty;
 316                         SendHeaders(index->ContentSize(), 200, empty);
 317                         this->Write(index->Contents());
 318                 }
 319                 else
 320                 {
 321                         claimed = false;
 322                         HTTPRequest httpr(request_type,uri,&headers,this,this->GetIP(),postdata);
 323                         Event acl((char*)&httpr, (Module*)HttpModule, "httpd_acl");
 324                         acl.Send(this->ServerInstance);
 325                         if (!claimed)
 326                         {
 327                                 Event e((char*)&httpr, (Module*)HttpModule, "httpd_url");
 328                                 e.Send(this->ServerInstance);
 329                                 if (!claimed)
 330                                 {
 331                                         SendHTTPError(404);
 332                                 }
 333                         }
 334                 }
 335         }
 336
 337         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 338         {
 339                 SendHeaders(n->str().length(), response, *hheaders);
 340                 this->Write(n->str());
 341         }
 342 };
 343
 344 /** Spawn HTTP sockets from a listener
 345  */
 346 class HttpListener : public ListenSocketBase
 347 {
 348         FileReader* index;
 349
 350  public:
 351         HttpListener(InspIRCd* Instance, FileReader *idx, int port, const std::string &addr) : ListenSocketBase(Instance, port, addr)
 352         {
 353                 this->index = idx;
 354         }
 355
 356         virtual void OnAcceptReady(const std::string &ipconnectedto, int nfd, const std::string &incomingip)
 357         {
 358                 new HttpServerSocket(ServerInstance, nfd, (char *)incomingip.c_str(), index); // ugly cast courtesy of bufferedsocket
 359         }
 360 };
 361
 362 class ModuleHttpServer : public Module
 363 {
 364         std::vector<HttpServerSocket *> httpsocks;
 365         std::vector<HttpListener *> httplisteners;
 366  public:
 367
 368         void ReadConfig()
 369         {
 370                 int port;
 371                 std::string host;
 372                 std::string bindip;
 373                 std::string indexfile;
 374                 FileReader* index;
 375                 HttpListener *http;
 376                 ConfigReader c(ServerInstance);
 377
 378                 httpsocks.clear(); // XXX this will BREAK if this module is made rehashable
 379                 httplisteners.clear();
 380
 381                 for (int i = 0; i < c.Enumerate("http"); i++)
 382                 {
 383                         host = c.ReadValue("http", "host", i);
 384                         bindip = c.ReadValue("http", "ip", i);
 385                         port = c.ReadInteger("http", "port", i, true);
 386                         indexfile = c.ReadValue("http", "index", i);
 387                         index = new FileReader(ServerInstance, indexfile);
 388                         if (!index->Exists())
 389                                 throw ModuleException("Can't read index file: "+indexfile);
 390                         http = new HttpListener(ServerInstance, index, port, (char *)bindip.c_str()); // XXX this cast SUCKS.
 391                         httplisteners.push_back(http);
 392                 }
 393         }
 394
 395         ModuleHttpServer(InspIRCd* Me) : Module(Me)
 396         {
 397                 ReadConfig();
 398                 HttpModule = this;
 399                 Implementation eventlist[] = { I_OnRequest };
 400                 ServerInstance->Modules->Attach(eventlist, this, 1);
 401         }
 402
 403         virtual const char* OnRequest(Request* request)
 404         {
 405                 claimed = true;
 406                 HTTPDocument* doc = (HTTPDocument*)request->GetData();
 407                 HttpServerSocket* sock = (HttpServerSocket*)doc->sock;
 408                 sock->Page(doc->GetDocument(), doc->GetResponseCode(), &doc->headers);
 409                 return NULL;
 410         }
 411
 412
 413         virtual ~ModuleHttpServer()
 414         {
 415                 for (size_t i = 0; i < httplisteners.size(); i++)
 416                 {
 417                         delete httplisteners[i];
 418                 }
 419
 420                 for (size_t i = 0; i < httpsocks.size(); i++)
 421                 {
 422                         ServerInstance->SE->DelFd(httpsocks[i]);
 423                         httpsocks[i]->Close();
 424                         delete httpsocks[i]->GetIndex();
 425                 }
 426                 ServerInstance->BufferedSocketCull();
 427         }
 428
 429         virtual Version GetVersion()
 430         {
 431                 return Version("$Id$", VF_VENDOR | VF_SERVICEPROVIDER, API_VERSION);
 432         }
 433 };
 434
 435 MODULE_INIT(ModuleHttpServer)